لم أفهم هذا الكود

fun main(args: Array<String>) {
    var n:Int
    var s = 0

    do
    {
        print("Enter a number one: ")
        n = readLine()!!.toInt()
    }
    while(n<1 || n%2 == 0)

    for (i in 1 .. n/2+1)
    {
        s++
        for (k in 1 until (n/2)-i+2)
        {
            print(" ")
        }
        for (j in 1 .. i*2-1)
        {
            if ( j == 1 || j == s*2-1)
            {
                print("*")
            }
            else
            {
                print(" ")
            }
        }
        println()
    }
    s = n
    for (f in 1 .. n/2)
    {
        for (k in 1 .. f)
        {
            print(" ")
        }
        for (j in 1 until ((n/2)+2-f)*2-2)
        {
            if(j == 1 || j == s-(f*2))
            {
                print("*")
            }
            else
            {
                print(" ")
            }
        }
        println()
    }
}

for (k in 1 until (n/2)-i+2)

(n/2)-i+2

for (j in 1 until ((n/2)+2-f)*2-2)

((n/2)+2-f)*2-2